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Canada

Lights in the evening sky triggered an invasion of chatter about UFOs in the Twitterverse on Sunday.

Two videos posted to YouTube by Sarah Chun of North York shows a series of unexplained lights hovering over neighbourhoods in the Yonge St.-Sheppard Ave. area in north Toronto on Saturday night.

At least one police officer -- Const. Craig Brister -- attributed the spectacle to a toy helicopter known as a "quadcopter."

Brister, who was on patrol Saturday night, posted his explanation of the event on Twitter after someone showed him the video of the lights.

Chun, meanwhile, went to her balcony to take a closer look Saturday night, after noticing the lights while working on her laptop.

"I saw something flashing. Especially the diagonal lights, they were kind of shooting upwards," Chun said. "I thought it might be a helicopter at first, but then it wasn't moving, it was just flashing. I didn't know what it was."

Many witnesses posted images and videos on social media.

Chatter about a potential alien invasion force led to #ufo and #toronto trending on Twitter.

Police Sgt. Barry White said several officers saw the lights and also thought it may have been a toy helicopter but could not find anyone flying such a craft.

NORAD saw nothing unusual on radar over the skies of Toronto and has received no calls reporting the incident, according to spokesman Julie Roberge.

She added most UFO sightings turn out to be aircraft or other normal phenomena.

"We never usually find anything; there is usually an explanation," Roberge said.

Michelle Bishop, spokesman for Nav Canada -- a private organization that monitors Canadian airspace -- said no pilots reported seeing lights over Toronto.

No one reported anything to the Greater Toronto Airport Authority, either, said spokesman Corrinne Madden.